rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (10499 ticks this GP) idle=dd1/1/0x4000000000000000 softirq=43817/43818 fqs=76
(t=10500 jiffies g=63441 q=1391)
rcu: rcu_preempt kthread starved for 10324 jiffies! g63441 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:28688 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4984 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6265
schedule+0xd2/0x260 kernel/sched/core.c:6338
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 18954 Comm: syz-executor.1 Not tainted 5.15.0-rc7-next-20211029-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x50/0x60 kernel/kcov.c:206
Code: 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 83 f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 48 83 c0 01 <48> 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55 41 54 49 89
RSP: 0018:ffffc9000388f920 EFLAGS: 00000216
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc9000b572000
RDX: 0000000000040000 RSI: ffffffff88d82180 RDI: 0000000000000003
RBP: ffff88802e900000 R08: 0000000000003fff R09: 0000000000000000
R10: ffffffff88d82172 R11: 0000000000000000 R12: 000000004a359a00
R13: dffffc0000000000 R14: ffff888082552000 R15: ffff88801d83ede0
FS: 00007f6b4b099700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b4b0b9ff8 CR3: 0000000035973000 CR4: 00000000003526e0
Call Trace:
__io_uring_show_fdinfo fs/io_uring.c:10155 [inline]
io_uring_show_fdinfo+0x3a1/0x1372 fs/io_uring.c:10240
seq_show+0x58d/0x800 fs/proc/fd.c:68
seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
seq_read+0x3e0/0x5b0 fs/seq_file.c:162
do_loop_readv_writev fs/read_write.c:746 [inline]
do_loop_readv_writev fs/read_write.c:733 [inline]
do_iter_read+0x501/0x760 fs/read_write.c:788
vfs_readv+0xe5/0x150 fs/read_write.c:906
do_preadv fs/read_write.c:998 [inline]
__do_sys_preadv fs/read_write.c:1048 [inline]
__se_sys_preadv fs/read_write.c:1043 [inline]
__x64_sys_preadv+0x231/0x310 fs/read_write.c:1043
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6b4db86ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b4b099188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f6b4dc9a1a0 RCX: 00007f6b4db86ae9
RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000008
RBP: 00007f6b4dbe0f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc2e622a2f R14: 00007f6b4b099300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 18924 Comm: syz-executor.1 Not tainted 5.15.0-rc7-next-20211029-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2620
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_pc+0x4c/0x60 kernel/kcov.c:205
Code: 0e 85 c9 74 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 83 f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 <48> 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55
RSP: 0018:ffffc90003777920 EFLAGS: 00000246
RAX: 000000000003ffff RBX: 0000000000000000 RCX: ffffc9000a5b2000
RDX: 0000000000040000 RSI: ffffffff88d82180 RDI: 0000000000000003
RBP: ffff88802e000000 R08: 0000000000003fff R09: 0000000000000000
R10: ffffffff88d82172 R11: 0000000000000000 R12: 000000004a0e5a34
R13: dffffc0000000000 R14: ffff888080fa5000 R15: ffff88806f24e128
__io_uring_show_fdinfo fs/io_uring.c:10155 [inline]
io_uring_show_fdinfo+0x3a1/0x1372 fs/io_uring.c:10240
seq_show+0x58d/0x800 fs/proc/fd.c:68
seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
seq_read+0x3e0/0x5b0 fs/seq_file.c:162
do_loop_readv_writev fs/read_write.c:746 [inline]
do_loop_readv_writev fs/read_write.c:733 [inline]
do_iter_read+0x501/0x760 fs/read_write.c:788
vfs_readv+0xe5/0x150 fs/read_write.c:906
do_preadv fs/read_write.c:998 [inline]
__do_sys_preadv fs/read_write.c:1048 [inline]
__se_sys_preadv fs/read_write.c:1043 [inline]
__x64_sys_preadv+0x231/0x310 fs/read_write.c:1043
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6b4db86ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b4b0fc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f6b4dc99f60 RCX: 00007f6b4db86ae9
RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000008
RBP: 00007f6b4dbe0f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc2e622a2f R14: 00007f6b4b0fc300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 35 8b 82 ac 15 xor $0x15ac828b,%eax
5: 00 00 add %al,(%rax)
7: 85 c0 test %eax,%eax
9: 74 2b je 0x36
b: 8b 82 88 15 00 00 mov 0x1588(%rdx),%eax
11: 83 f8 02 cmp $0x2,%eax
14: 75 20 jne 0x36
16: 48 8b 8a 90 15 00 00 mov 0x1590(%rdx),%rcx
1d: 8b 92 8c 15 00 00 mov 0x158c(%rdx),%edx
23: 48 8b 01 mov (%rcx),%rax
26: 48 83 c0 01 add $0x1,%rax
* 2a: 48 39 c2 cmp %rax,%rdx <-- trapping instruction
2d: 76 07 jbe 0x36
2f: 48 89 34 c1 mov %rsi,(%rcx,%rax,8)
33: 48 89 01 mov %rax,(%rcx)
36: c3 retq
37: 0f 1f 00 nopl (%rax)
3a: 41 55 push %r13
3c: 41 54 push %r12
3e: 49 rex.WB
3f: 89 .byte 0x89